女性，33岁。因呕血200ml，黑便3次伴晕 厥而被抬送来诊。查体：贫血貌，腹平软，剑下 轻压痛，肝脾肋下未及，移动性浊音阴性。为了明确诊断，首选的检査方法为

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31867' and id < 2547892 and id<>'2547892' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31867' and id > 2547892 and id<>'2547892' order by id asc limit 5